Here's how to calculate the moles of (NH4)2S in 150 g:

1. Find the molar mass of (NH4)2S

* N (Nitrogen): 14.01 g/mol * 2 = 28.02 g/mol

* H (Hydrogen): 1.01 g/mol * 8 = 8.08 g/mol

* S (Sulfur): 32.07 g/mol

Total Molar Mass = 28.02 + 8.08 + 32.07 = 68.17 g/mol

2. Use the formula: moles = mass / molar mass

* moles = 150 g / 68.17 g/mol

* moles ≈ 2.20 moles

Therefore, there are approximately 2.20 moles of (NH4)2S in 150 g.